public class Test2 {


}

/*
class Solution {
    public boolean isLegal(char ch) {
        if (ch >= 'a' && ch <= 'z' || ch >= '0' && ch <= '9') {
            return true;
        }
        return false;
    }

    public boolean isPalindrome(String s) {
        int left = 0;
        int right = s.length() - 1;
        s = s.toLowerCase();
        while (left < right) {
            char ch1 = s.charAt(left);
            char ch2 = s.charAt(right);
            if (!isLegal(ch1)) {
                left++;
                continue;
            }
            if (!isLegal(ch2)) {
                right--;
                continue;
            }
            if (ch1 != ch2) {
                return false;
            }
            left++;
            right--;
        }
        return true;
    }
}*/
